Here's the code I used. Hope it helps. I had to add the Java to make sure that the <div> appeared in the right spot at different screen resolutions.
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<td align=left valign=top background="/images2/blurry_background2.jpg" height="247">
<SCRIPT LANGUAGE="Javascript"><!--
if (self.screen) { // for NN4 and IE4
width = screen.width
height = screen.height
// Testing this first prevents firing the slow Java of NN4
}
else if (self.java) { // for NN3 with enabled Java
var jkit = java.awt.Toolkit.getDefaultToolkit();
var scrsize = jkit.getScreenSize();
width = scrsize.width;
height = scrsize.height;
}
else{
width = height = '?' // N2, E3, N3 w/Java off, probably Opera and WebTV
}
//document.write("Your Screen Resolution is:"

;
//document.write(width +"×"+ height)
switch(width)
{
case '1024':
left = 122;
break;
case "800":
left = 11;
break;
default:
left = 11;
break;
}//end of switch
//or whatever based on the above results
//--></SCRIPT>
<div id="Layer1" style="position:absolute; width:760px; height:247px; z-index:1; left: document.write(left); top: 130px; overflow: auto">
<table width="100%" cellpadding="8" cellspacing="0" border="0">
<tr>
<td align=left>
text is here
</td>
</tr>
</table></div>
</td>
</div>
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Cheers,